Temperature and Answer Essay

1739 Words Sep 9th, 2011 7 Pages
| 1. | | Passing an electric current through a certain substance produces oxygen and sulfur. This substance cannot be a(n) Your Answer: | element. | | | An element cannot be broken down into other elements. | | 2. | | Pick the chemical change that occurs when a lit match is held under a piece of metal. Your Answer: | match burns | | | Chemical changes, which release heat and light, occur during the combustion process. | | 3. | | Which identification is incorrect for the elements listed? Your Answer: | Zn, zirconium | | | Zn is zinc; Zr is zirconium. | | 4. | | Which of the following statements is false? Your Answer: | A theory can be proved correct if sufficient experimental data is acquired. | | | …show more content…
Note: The volume of a sphere is V = (4/3)r3. Your Answer: | 7.4 x 102 grams | | | The volume is 65 cm3. | | 29. | | Which number of significant figures is incorrect? Your Answer: | 0.00050 (five) | | | This is incorrect since the first four zeros do not count. The correct number of significant figures is two. | | 30. | | The average distance from the Earth to the Moon, 383,000,000 m, can also be expressed as Your Answer: | 3.83 x 1010 cm. | | | All the zeros and the 83 should be counted when determining exponential notation. | | 31. | | Which of the following is a physical change? Your Answer: | boiling water | | | Phase changes are physical changes. In this example, water changes from the liquid state to the gas state. | | 32. | | Which of the following is a homogeneous mixture? Your Answer: | nitrogen | | Correct Answer: | air | | | | Nitrogen is a pure substance. | | 33. | | A temperature of 63°F is _______ K. Your Answer: | 290 | | | 63°F = 17°C = 290 K. | | 34. | | Which of the following numbers contains six significant figures? Your Answer: | 1000.00 | | | All zeros in this number are significant. | | 35. | | Which is not correctly represented by the right number of significant figures? Your Answer: | ((2.70/3.00) -2.0) x (1.20) = -1.32 | | | The answer should only have two significant figures. | | 36. | | A

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